CN110216960A - A kind of bloom low haze PE heat shrink films and preparation method thereof - Google Patents
A kind of bloom low haze PE heat shrink films and preparation method thereof Download PDFInfo
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- CN110216960A CN110216960A CN201910476124.XA CN201910476124A CN110216960A CN 110216960 A CN110216960 A CN 110216960A CN 201910476124 A CN201910476124 A CN 201910476124A CN 110216960 A CN110216960 A CN 110216960A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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Abstract
The present invention relates to a kind of bloom low haze PE heat shrink films and preparation method thereof.The film layer structure of the PE heat shrink films is followed successively by corona layer, secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer；It is (28~32): (8~12): (58~62): metallocene PE, linear low density polyethylene, low density polyethylene (LDPE) and the processing aid of (0.1~0.3) that corona layer, middle layer, hot sealing layer, which respectively include mass ratio,；It is (28~32): (28~32): metallocene PE, high density polyethylene (HDPE) and the low density polyethylene (LDPE) of (38~42) that secondary outer layer one, secondary outer layer two, which respectively include mass ratio,.The PE heat shrink films shrinking percentage is high, and contraction memory function is strong, and tensile strength is big, and puncture resistant ability is strong, resistance to respectively to tearing；Have the characteristics that mist degree is low, transparency is high, glossiness is high；Coefficient of friction is moderate and stablizes, and the thickness uniformity and flatness are good, and printing adaptability is good.
Description
Technical field
The invention belongs to field of membrane material, it is specifically related to a kind of bloom low haze PE heat shrink films and preparation method thereof.
Background technique
Currently, the market development of plastic shrink film is quickly, related in fields such as food, drug, electronic apparatus, metal products
And several material types such as common are PVC, POF, PE, OPS and PET, have good flexibility, impact resistance, tear resistance it is strong,
Not cracky, be not afraid of tide, the features such as shrinking percentage is big, apparent advantage makes it that conventional carton packaging be replaced to become development trend.
And compared with other plastic shrink films, PE heat shrink films are at low cost, environmentally friendly (recyclable), shelf excellent effect, have good anti-
Shield property, these performances promote it as the bundling package toast hand of the one integral piece products such as beer, pop can, mineral water and various beverage classes
Can heat choosing, major drink company actively pushes forward to pack environmentally friendly transition in addition, and the market demand increasingly increases.However, in the market
PE heat shrink films when reaching certain thickness, the shrink film coloured silk film transparency and glossiness after printing are general, cannot be fine
Pack content and printing information, while this just needs certain thickness requirement (meeting physical mechanical property), optics is presented in ground
Performance (low haze, high glaze, the high grade of transparency) also good PE heat shrink films, with up to clear beautiful shelf display effect.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of bloom low haze PE heat shrink films and preparation method thereof.
In order to achieve the object of the present invention, the invention adopts the following technical scheme:
A kind of bloom low haze PE heat shrink films, the film layer structure of the PE heat shrink films be followed successively by corona layer, secondary outer layer one,
Middle layer, secondary outer layer two and hot sealing layer；
The corona layer, middle layer, hot sealing layer include that mass ratio is (28~32): (8~12): (58~62): (0.1
~0.3) metallocene PE, linear low density polyethylene, low density polyethylene (LDPE) and processing aid；
The secondary outer layer one, secondary outer layer two include that mass ratio is (28~32): (28~32): the metallocene of (38~42)
Polyethylene, high density polyethylene (HDPE) and low density polyethylene (LDPE).
Further technical solution, 74~76 microns of the thickness of the PE heat shrink films, the corona layer, secondary outer layer one, in
Interbed, secondary outer layer two and hot sealing layer thickness ratio are 12:8:35:8:12.
Further technical solution, in the corona layer, hot sealing layer the metallocene PE trade mark be angstrom can a treasured 2005MC, institute
State corona layer, the linear low density polyethylene trade mark is 118NJ, low density polyethylene (LDPE) in the corona layer, hot sealing layer in hot sealing layer
The trade mark is Yangba 2420D, and the processing aid trade mark is 100991-k in the corona layer, hot sealing layer；
The metallocene PE trade mark is an angstrom energy treasured 2703MC, linear low density polyethylene in the middle layer in the middle layer
The alkene trade mark is 118NJ, and the low density polyethylene (LDPE) trade mark is Yangba 2420D, processing aid board in the middle layer in the middle layer
Number be 100991-k；
In the secondary outer layer one, secondary outer layer two the metallocene PE trade mark be angstrom can a treasured 2703MC, it is the secondary outer layer one, secondary
The two medium high density polyethylene trade mark of outer layer is BM6246LS, and the low density polyethylene (LDPE) trade mark is in the secondary outer layer one, secondary outer layer two
Yangba 2420D.
A kind of preparation method of the bloom low haze PE heat shrink films, comprising the following steps:
Step 1, it squeezes out: by the raw material of the corona layer, secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer by upper
Component ratio requirement is stated to put into German WH five-layer co-squeezing inflation film manufacturing machine successively through slot type machine barrel, 1st area of machine barrel, 2nd area of machine barrel, machine barrel
3rd area, 4th area of machine barrel, draping area, flange, which are heated into after melt, is extruded as tube through die head；
Extrusion parameter: the slot type barrel temperature is 50 ± 5 DEG C, and 1 area's temperature of machine barrel is 185 ± 5 DEG C, the machine barrel
2nd area, 3rd area of machine barrel, 4th area of machine barrel, draping area, flange temperature are 190 ± 5 DEG C, and the die head temperature is 195 ± 5 DEG C；It squeezes out
Measure 540 ± 50kg/h；
Step 2, blown film: the tube is filled with compressed air after exiting the die, from die head centre bore, is propelled the price of into
Blister film；
Blown film parameter: blow-up ratio is 3.4~3.6, outer cold blast rate 57%, interior cold intake 47%, interior cold air output 93%；
Step 3, cooling and shaping: blister film is cooling under the cooling wind effect of vane, and adjusts sizing cage location and make film bubble
Sizing；
Cooling and shaping parameter: sizing cage height 1260mm, outer 18 ± 5 DEG C of cold inlet air temperature, interior cold inlet air temperature 18 ± 5
DEG C, air cushion roller air quantity 100% ± 20%；
Step 4, thickness measuring corona: the thickness of film is measured after cooling and shaping by automatic measuring thickness device, then through traction device
Traction rises and ceases bubble folder partially by collapser, then holds together to form duplicature by traction roller folder, and by corona unit to film
Outer surface carries out sided corona treatment；
Thickness measuring corona parameter: 7 ± 5KW of corona discharge power, 25 ± 5m/min of hauling speed；Two 10 ± 2N of drawing tension, winding
60 ± 10N of roller tension；
Step 5, trimming is wound: being batched finally by wrap-up trimming fragment as bloom low haze PE heat shrink films；
Trimming winds parameter: winding mode is that centre of surface crimps, two sides 100 ± 10N of winding tension, taper 10% ±
2%.
The beneficial effects of the present invention are:
Using the lower ldpe resin of finger is melted, (trade mark is Yangba 2420D), content to five layer formulas of the invention
More than whole half, there is high shrinkage (especially lateral shrinkage), high glaze, low haze, transparency height, impact resistance
The features such as energy is good, easy processing forms supports shrink film basic performance for constructing the frame of entire shrinkable film；It is aided with again each
Other resins of layer different ratio, to reach the composite request of shrink film properties.
The corona layer has very high lustrous surface using metallocene PE resin (trade mark is an angstrom energy treasured 2005MC)
Degree, the features such as light transmittance is big, tensile strength is high, can promote the tensile strength of film entirety when for bundling package, table when printing
Face effect is bright and new beautiful, and content visibility is high, can preferably show product information；Use a small amount of linear low density polyethylene
Resin (trade mark 118NJ), while providing good environmental stress crack resistance, small molecule content is low, corona rear surface
Tension is high and the retention time is long, facilitates the attachment for printing ink；A small amount of fluorine-containing auxiliary agent is added, and makes between resin compatibility more
It is good, it is easy to process.When hot sealing layer metallocene PE resin can provide product heat-sealing higher heat seal strength or it is fervent when it is preferable
Sealing-strength, it is identical as corona layer resin formula, formed symmetrical structure.
The secondary outer layer one and time two use of outer layer, which are melted, refers to that (trade mark is that angstrom energy is precious to lower metallocene PE resin
2703MC), there is excellent tensile strength and higher shrinking percentage, using high-density polyethylene resin (trade mark BM6246LS),
Certain stiffness is provided for shrinkable film, and high to the chucking power of content after packaging, it is strong to shrink memory function；Because of its mist degree
Higher (the lower choosing of mist degree in HDPE), therefore to account for entire film quality percentage relatively small for two time outer layers, it is certain meeting
Under the conditions of stiffness, to promote the optical property of monolithic film membrane.
The middle layer is poly- using high-intensitive metallocene PE resin (trade mark is an angstrom energy treasured 2703MC), linea low density
The combination of vinyl (trade mark 118NJ) and ldpe resin (trade mark is Yangba 2420D), with outermost resin phase
Closely, compatibility is good, and produces convenient for blown film, additionally provides preferable physical mechanical property.
Using five layers of symmetrical structure, shrink film is smooth not curled, promotes packaging production efficiency；Secondary outer layer one and time outer layer two
Density is higher, and middle layer density is taken second place, and two surface layer density of corona layer and hot sealing layer are slightly less than middle layer, such structure design
So that shrink tension distribution is relatively uniform after film reheating is cooling, film each position shrinks more smooth, content when packaging
Stress is also uniform.
All resins that above-mentioned formula uses are free of opening slipping agent, and also in addition do not add appointing in addition to fluorine-containing auxiliary agent
What auxiliary agent, so that film small molecule is precipitated less, coefficient of friction (COF) can keep for a long time stable, convenient for packing away machine and product
Stacking；And the resin selected, in same type resin, shrinking percentage is very high, and crystallization rate is fast, and optical property is very good.
PE heat shrink films of the present invention are suitble to the requirement of automated packaging equipment；Shrinking percentage is high, and contraction memory function is strong, draws
It is big to stretch intensity, puncture resistant ability is strong, resistance to respectively to tearing；With excellent optical property, (mist degree is low, transparency is high, glossiness
It is high)；Kinematics and static friction coefficient is moderate and stablizes (satisfaction walks machine and stacking), the thickness uniformity and flatness is good (does not roll up after blocking
It is bent) and good printing adaptability.
(2) for the present invention in blown film, whole processing temperature is higher, and the lateral shrinkage of film is big；Control vane disengaging
Air quantity, temperature and dew point position, keep cooling time for film bubble short, promote the light transmittance of film, reduce mist degree.So-called dew point is frost
Line refers to that plastics are entered the boundary of elastomeric state by viscous state, is a high-visible line of naked eyes, can be big by changing air quantity
Small, temperature etc. controls its upper and lower position, and dew point position is low, then film performance is close to oriented film；Then film performance connects position height
It is bordering on casting films.The present invention uses high temperature process and cooling time is short, i.e. extruder processing temperature is higher compared with common PE blown film,
Rapid cooling after to die orifice can make the crystalline rate of film become faster, and tightness is good when for packing product and shrinks holding persistently.
Biggish blow-up ratio keeps film lateral shrinkage and light transmittance larger；It is larger to control winding tension, so that the draftability of film
Energy, longitudinal contraction rate and light transmittance are got higher.
Detailed description of the invention
Fig. 1 is the film layer structure schematic diagram of PE heat shrink films of the present invention.
Fig. 2 is the preparation method flow chart of PE heat shrink films of the present invention.
Specific embodiment
More specific detail is made to PE heat shrink films preparation method of the present invention below with reference to embodiment:
Raw materials used source is as follows in following embodiment:
Embodiment 1
The preparation method of bloom low haze PE heat shrink films of the present invention, comprising the following steps:
Step 1, squeeze out: by the PE resin of the corona layer, secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer and
Auxiliary agent is separately added into German WH5 layers of coextrusion film blowing machine hopper by said components proportion requirement, passes through heating device and extruder
Effect becomes melt, and melt is extruded as tube through annular die head；
The corona layer, middle layer, hot sealing layer include the metallocene PE that mass ratio is 30:10:60:0.2, linear
Low density polyethylene (LDPE), low density polyethylene (LDPE) and processing aid；
The secondary outer layer one, secondary outer layer two include metallocene PE, the high-density polyethylene that mass ratio is 30:30:40
Alkene and low density polyethylene (LDPE).
German WH5 layers of coextrusion film blowing machine extrusion temperature:
Other extrusion parameters:
Extrusion output: 540 ± 50kg/h；Corresponding five screw rods of five extrusion dies, the screw diameter is respectively corona layer
60mm, one 70mm of secondary outer layer, middle layer 105mm, two 70mm of secondary outer layer, hot sealing layer 60mm；
Screw slenderness ratio L/D=30:1, die gap=1.25~2.25mm, blow-up ratio are 3.4~3.6 (unilateral windings
Width is close to 2600mm)；
Corona layer melt pressure 450 ± 20bar, secondary one 400 ± 20bar of melt pressure of outer layer, middle layer melt pressure 360
± 20bar, secondary two 400 ± 20bar of melt pressure of outer layer, 450 ± 20bar of hot sealing layer melt pressure；
Step 2, blown film: tube is filled with a certain amount of compressed air after leaving die orifice, from die head centre bore, is blown
Rise by blister film；
Blown film parameter: ultrasonic wave 92.8%, outer cold blast rate 57%, interior cold intake 47%, interior cold air output 93%；
Step 3, cooling and shaping: blister film is cooling under the cooling wind effect of vane, and adjusts sizing cage (foam stabilizing device) position
Setting makes film bubble be formed；
Cooling and shaping parameter: sizing cage height 1260mm, outer 18 ± 5 DEG C of cold inlet air temperature, interior cold inlet air temperature 18 ± 5
DEG C, air cushion roller air quantity 100% ± 20%；Air is filled inside air cushion roller to come out from hole, so that film is blown afloat to come, it is existing cold
But it acts on, and can be reduced the friction between film and roller, protect film surface；
Step 4, thickness measuring corona: the thickness of film is measured after cooling and shaping by automatic measuring thickness device, then through traction device
Traction rises to certain distance, ceases bubble folder partially by collapser, after hold together to form duplicature by traction roller folder, and pass through corona unit
The outer surface of corona film；
Thickness measuring corona parameter: 7 ± 5KW of corona discharge power, 25 ± 5m/min of hauling speed；Two drawing tension 10N ± 2N, winding
60 ± 10N of roller tension；Two traction, wind-up roll are all drive rolls, and when corona comes film bubble pull-up at the top of corona equipment
It is a traction, the other end is then two tractions at the top of corona equipment, by coming the winding of corona device bottom under after two tractions
It is wind-up roll, this three drive rolls have drawing tension；
Step 5, trimming is wound: being batched finally by wrap-up trimming fragment as PE film roll.
Trimming winds parameter: winding mode is centre of surface curling, the side A/B (two sides) 100 ± 10N of winding tension, taper
10% ± 2%.
Embodiment 2
The preparation method is the same as that of Example 1, only adjusts to each film layer formula, specifically: the corona layer, middle layer, heat
Sealing include mass ratio be the metallocene PE of 28:8:58:0.1, linear low density polyethylene, low density polyethylene (LDPE) and
Processing aid；The secondary outer layer one, secondary outer layer two include metallocene PE, the high-density polyethylene that mass ratio is 28:28:38
Alkene and low density polyethylene (LDPE).
Embodiment 3
The preparation method is the same as that of Example 1, only adjusts to each film layer formula, specifically: the corona layer, middle layer, heat
Sealing include the metallocene PE of mass ratio 32:12:62:0.3, linear low density polyethylene, low density polyethylene (LDPE) and
Processing aid；The secondary outer layer one, secondary outer layer two include metallocene PE, the high-density polyethylene that mass ratio is 32:32:42
Alkene and low density polyethylene (LDPE).
The performance test results of the above embodiment of the present invention preparation gained PE heat shrink films are as follows:
Claims (4)
1. a kind of bloom low haze PE heat shrink films, it is characterised in that: the film layer structure of the PE heat shrink films be followed successively by corona layer,
Secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer；
The corona layer, middle layer, hot sealing layer include that mass ratio is (28~32): (8~12): (58~62): (0.1~
0.3) metallocene PE, linear low density polyethylene, low density polyethylene (LDPE) and processing aid；
The secondary outer layer one, secondary outer layer two include that mass ratio is (28~32): (28~32): the poly- second of the metallocene of (38~42)
Alkene, high density polyethylene (HDPE) and low density polyethylene (LDPE).
2. bloom low haze PE heat shrink films as described in claim 1, it is characterised in that: the thickness 74 of the PE heat shrink films~
76 microns, the corona layer, secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer thickness ratio are 12:8:35:8:12.
3. bloom low haze PE heat shrink films as described in claim 1, it is characterised in that: luxuriant in the corona layer, hot sealing layer
The metal polyethylene trade mark is an angstrom energy treasured 2005MC, and the linear low density polyethylene trade mark is 118NJ in the corona layer, hot sealing layer,
The low density polyethylene (LDPE) trade mark is Yangba 2420D, processing aid board in the corona layer, hot sealing layer in the corona layer, hot sealing layer
Number be 100991-k；
The metallocene PE trade mark is an angstrom energy treasured 2703MC, linear low density polyethylene board in the middle layer in the middle layer
It number is 118NJ, the low density polyethylene (LDPE) trade mark is Yangba 2420D in the middle layer, and the processing aid trade mark is in the middle layer
100991-k；
The metallocene PE trade mark is an angstrom energy treasured 2703MC, the secondary outer layer one, secondary outer layer in the secondary outer layer one, secondary outer layer two
The two medium high density polyethylene trades mark are BM6246LS, and the low density polyethylene (LDPE) trade mark is Yangba in the secondary outer layer one, secondary outer layer two
2420D。
4. a kind of preparation method of bloom low haze PE heat shrink films as described in any one of claims 1-3, it is characterised in that
The following steps are included:
Step 1, it squeezes out: the raw material of the corona layer, secondary outer layer one, middle layer, secondary outer layer two and hot sealing layer is pressed above-mentioned group
Point proportion requirement put into German WH five-layer co-squeezing inflation film manufacturing machine successively through slot type machine barrel, 1st area of machine barrel, 2nd area of machine barrel, 3rd area of machine barrel,
4th area of machine barrel, draping area, flange, which are heated into after melt, is extruded as tube through die head；
Extrusion parameter: the slot type barrel temperature is 50 ± 5 DEG C, and 1 area's temperature of machine barrel is 185 ± 5 DEG C, 2nd area of machine barrel,
3rd area of machine barrel, 4th area of machine barrel, draping area, flange temperature are 190 ± 5 DEG C, and the die head temperature is 195 ± 5 DEG C；Extrusion output
540±50kg/h；
Step 2, blown film: the tube is filled with compressed air after exiting the die, from die head centre bore, is propelled the price of into blister
Film；
Blown film parameter: blow-up ratio is 3.4~3.6, outer cold blast rate 57%, interior cold intake 47%, interior cold air output 93%；
Step 3, cooling and shaping: blister film is cooling under the cooling wind effect of vane, and adjusting sizing cage location makes film bubble be formed；
Cooling and shaping parameter: sizing cage height 1260mm, outer 18 ± 5 DEG C of cold inlet air temperature, interior 18 ± 5 DEG C of cold inlet air temperature, gas
Pad roller air quantity 100% ± 20%；
Step 4, thickness measuring corona: the thickness of film is measured after cooling and shaping by automatic measuring thickness device, then is drawn through traction device
Rise and bubble folder is ceased partially by collapser, then holds together to form duplicature by traction roller folder, and by corona unit to the appearance of film
Face carries out sided corona treatment；
Thickness measuring corona parameter: 7 ± 5KW of corona discharge power, 25 ± 5m/min of hauling speed；Two 10 ± 2N of drawing tension, wind-up roll
60 ± 10N of power；
Step 5, trimming is wound: being batched finally by wrap-up trimming fragment as bloom low haze PE heat shrink films；
Trimming winds parameter: winding mode is centre of surface curling, two sides 100 ± 10N of winding tension, taper 10% ± 2%.
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| CN114083855A (en) * | 2021-11-30 | 2022-02-25 | 黄山永新股份有限公司 | High-performance lightweight PE heat shrinkable film and preparation method thereof |
| CN114603958A (en) * | 2022-03-09 | 2022-06-10 | 河间市精诚塑业有限公司 | Heat shrinkable film and preparation method thereof |
| CN115447241A (en) * | 2022-08-17 | 2022-12-09 | 黄山永新股份有限公司 | High-barrier single PE (polyethylene) recyclable material packaging film and production process thereof |
| CN115923289A (en) * | 2022-12-13 | 2023-04-07 | 青岛开美克橡塑有限公司 | High-transparency high-strength polyethylene heat shrinkable film and preparation method thereof |
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| CN114083855A (en) * | 2021-11-30 | 2022-02-25 | 黄山永新股份有限公司 | High-performance lightweight PE heat shrinkable film and preparation method thereof |
| CN114603958A (en) * | 2022-03-09 | 2022-06-10 | 河间市精诚塑业有限公司 | Heat shrinkable film and preparation method thereof |
| CN115447241A (en) * | 2022-08-17 | 2022-12-09 | 黄山永新股份有限公司 | High-barrier single PE (polyethylene) recyclable material packaging film and production process thereof |
| CN115923289A (en) * | 2022-12-13 | 2023-04-07 | 青岛开美克橡塑有限公司 | High-transparency high-strength polyethylene heat shrinkable film and preparation method thereof |
| CN115923289B (en) * | 2022-12-13 | 2023-10-10 | 青岛开美克橡塑有限公司 | High-transparency high-strength polyethylene heat-shrinkable film and preparation method thereof |
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